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From dab79ea5cd01187567b1761aaf1c329926483786 Mon Sep 17 00:00:00 2001
From: John Stebbins <stebbins@jetheaddev.com>
Date: Wed, 29 Oct 2014 10:54:44 -0700
Subject: [PATCH] matroskaenc: Fix writing zero duration subtitles
The matroska spec says blockduration == 0 means the frame is not a
keyframe. Since all subtitles are "keyframes", 0 blockduration should
not be written.
Fixes mkvalidator error messages for PGS subtitles.
---
libavformat/matroskaenc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 4ec474d..628300b 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1487,7 +1487,8 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
mkv_blockgroup_size(pkt->size));
duration = pkt->convergence_duration;
mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
- put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
+ if (duration > 0)
+ put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
end_ebml_master(pb, blockgroup);
}
--
1.9.3
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